Flagstaff, Arizona – Drivers and hikers in northern Arizona should keep one eye on the sky this Sunday as isolated thunderstorms threaten Flagstaff by late morning. The National Weather Service says there’s a 20% chance of showers and thunderstorms after 11 a.m., with gusty winds up to 18 mph that could impact high-elevation travel along I-40 and U.S. 180.
According to the NWS in Flagstaff, skies will start out sunny with a high near 86°F, but increasing instability after midday could spark short-lived, localized storms. Though not widespread, these summer storms could cause lightning hazards and slick roads. Outdoor plans — including hiking the San Francisco Peaks or visiting Walnut Canyon — should wrap by early afternoon or include alternate shelter options.
Looking Ahead:
- Monday: Mostly sunny, high near 87°F with another 20% chance of storms by late afternoon.
- Tuesday: A repeat pattern, with highs nearing 89°F and scattered showers possible after 11 a.m.
- Wednesday: Warmer, 91°F with wind gusts reaching 20 mph — minimal rain risk.
- Thursday: A stronger storm system builds in with 40% chance of showers, wind gusts 24 mph, and temps near 90°F.
- Friday: Storm risk lingers with 20% rain chance, continued heat, and southwest winds gusting up to 21 mph.
Flagstaff’s summer monsoon rhythm appears to be ramping up. If you’re headed outdoors this week, plan for earlier starts and monitor real-time radar.
More storm chances develop Thursday — stay tuned for updates from NWS Flagstaff.
